[jira] [Created] (ARROW-15054) Attribute nbytes of slice will return the value corresponding to the whole structure

["Adrien Hoarau (Jira)" <ji...@apache.org>]

Adrien Hoarau created ARROW-15054:
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             Summary: Attribute nbytes of slice will return the value corresponding to the whole structure
                 Key: ARROW-15054
                 URL: https://issues.apache.org/jira/browse/ARROW-15054
             Project: Apache Arrow
          Issue Type: Bug
          Components: Python
            Reporter: Adrien Hoarau


Whether for tables/arrays, slicing and then calling `nbytes` will return the value for the whole struct. I don't know if this is a bug or the desired behaviour (and if it is I would argue that it should return a result relative to the slice, and also ask if there is any way to get the memory size of my slice?).

 

```

import pyarrow

pyarrow.__version__

>>> 6.0.0

table = pyarrow.Table.from_arrays([pyarrow.array(['foo', 'bar', 'qux'], type=pyarrow.string())], names=["a"])

table.num_rows

>>> 3

table.nbytes

>>> 25

table.slice(0, 2).num_rows

>>> 2

table.slice(0, 2).nbytes

>>> 25

```



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